Hydrostatic ways, by comparison, do not have this contact. In a hydrostatic system, the guideways use a pressurized film of oil, with pockets in the way system. Features of Hydrostatic Slides • Very low friction, no friction at positioning • Movement Hydrostatic guideways can compensate for forces resulting from weight. Find Hydrostatic Guideway related suppliers, manufacturers, products and specifications on GlobalSpec – a trusted source of Hydrostatic Guideway information.
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Login to Your Account. Results 1 to 17 of Buideways any of you seen a lathe that had the ways refit with Hydrostatic guideways linear bearings rails?
I saw one at a local machine rebuilding compay today, actually it was in the process, they machined the original ways off and was fitting it with the linear rails, I always thought that linear rails wouldn’t hold up to the cutting pressure. They said that it was more or less an experiment, if it’s worth doing then I might look into fitting a few of our machines the same way! Do any of you have experience with this? I have a tremendiously huge amount of experience with hydrostatic ways.
I get confused when you throw in the word linear. I used to work on Waldrich Coburgh guide way grinders and waldrich Seigen five sided gantry mills.
Many years of service with “No” wear on critical ways. How anyone would ever convert a conventional machine to hydrostatic I would never no. Let me know how this turns out. Ever since this idea was proposed in the homemade lathe thread, I’ve been facinated with the idea. In the other thread, the idea was to use cylindrical ground round way bar for ease and trift and then have the carraige slide back and forth on hydrostatic linear bearings that would get pressure supplied to them from some external source.
I love the idea, though I’m sure that there would be a gotta or two along the development course. Anyway, I’d love to learn more about it if you could get picts that would be great! I could be wrong, but my understanding is “hydrostatic” ways are the box type of way. The sliding parts are allowed to move and get virtually no wear due to a pressurized oil film between them. Linear guidways are totally different They can take catting force, many machines have them, claiming faster rapid rates, more accurate moves, etc.
I’m not totally convinced. It has linear ways hydrkstatic the way around. Table load, I believe is 10K lbs The Waldrich Coburghs had semi round ways.
Anyways, hydrostatic floated on filterd refrigerated super clean oil and were for particularly acurate machines where the accuracy was so important wear was unthinkable. In storbook machine shop guideawys siding member continually floated in a magical super clean oil and one perfectly accurate metal part never touched the other perfectly accurat guixeways. In real machine shop the way guards weighed thousands of pounds, the lips on the way guards always needed attention.
Every four months would find you in there on your hands and knees with spray bottles of naptha and or more rags cleaning what contaminents got through the way covers.
Absolutely loved the machines but I do not miss the P. The late ‘s and on Lucas machines had “air over oil hydrostatic ways” The air picks up oil and is then applied at moderate pressure to the moving member.
The moving member actually rises about. Machines equipped with this system always have sir actuated clamps. These machines have the advantages of true hydrostatic ways without the problem of a lot of oil oozing out and needing recovery. Oil loss is minimal, there is no mechanical oil pressure pump. Noraml way oil is the lubricant. The Cintimatics were all round guideway machines That is not hydrostatic The very late very long table machines were box ways.
I see no advantave to hydrostratic ways on a lathe. Well, the original ways they planed off and the guideways that they hydrosttatic were a hydrpstatic shape. I said they were hydrostatic but that was just gujdeways that Guiseways threw off of hydrostayic top of my head. Actually I believe that hydrostatic means a hydraulic lift. Chris, the guy who runs the shop that was doing the upgrade gudieways that these bearings were supposed to be able to run without oil for quite a while without causeing any damage to the guideways.
I should be going over there again in the next couple of days hydrostayic will try to take some pics. But to be fair, they say it needs the right kind of work What might that be? Who has them in production now? Its obvious you dont have a clue about how fast hard turning is as compared to grinding. Who has them in production? Well, it probably ain’t your local job shop, but seeing as how the company has been around since beforethat would be a good indication someone buys what they make.
Hardinge has a hydrostatic way option on the Quest machines, called Hydroglide. This gives better damping during hard turning and interupted cutting and will produce better surface finish, part rounds, accuracy and tool life. Or rather, why are they so rare? From everything I read, it hydrostahic like these things should be dog simple and really cheap. Other than that it sounds like these things are just plain bearings with a hydraulic pump squeezing fluid out through them. Sounds like they eliminate thier own slop, and should be fairly easy to fabricate Isn’t the crank bearing on most car engines a hydrostatic bearing being fed off the oil pump?
That said, my Machinery’s Handbook says very little on them except that they should not be attempted hysrostatic special knowledge and understanding of complex design issues that can only be gotten from specializes and unspecified! That’s about as VooDoo and I’ve ever known Machinery’s to get! I hydostatic at Husky Injection Molding before starting my own business and they are a large consumer of Hembrug Lathes both in Europe and In Canada in the facilities where they make parts with molding surfaces.
They are used to do final machining on both molding surfaces with a 0.
They hold these tolerances and repeat them from part to part in materials hardened to about 50 Rc. The molding surface finish is turned to a quality level that allows final polishing without any other machining. There is a market for these machines but it definitely is not in a jobbing shop.
Hydrostatic guides are like aerostatic guides except they use oil instead of air. Hydrostatic guides provide exceptionally rigid motion with essentially zero friction. They also average the surface roughness out of the story and so provide exceptional accuracy this is why air-bearing spindles have such good true-in-round. Generally, the bearing surfaces are made of granite and the oil is fed under high pressure through either an orifice or, in more recent times, a porous graphite disk.
The orifices are cross-connected to provide stiffness. The cross-connection is the key to stiffness – increasing pressure on the top due to cutting forces will cause the pressure at the orifice to increase and this will increase the pressure on the bottom due to cross connection to compensate.
These kinds of bearings are used in many ultra-precision machines – for example Moore grinders. Bob, Thanks for the info. That book is expencive though! And has the worst rating and reveiws that I’ve ever seen on Amazon! Hydrostatic if maintained is long lasting.
Don’t think though it is magic.
Very expensive to maintain. Any devieations in the bed will be directly reflected in the accuracy. I dealt with ball screw grinders with hydrostatic ways. Nausiatingly nydrostatic weeks of lining them up. Waldrich Coburg guide way grinders, love them.
Take the table off, laser align them, put them back together, still not right, take them apart, realign them, put them together, check them, etc, etc,etc. Once they are guudeways, last for years. Keep the oil clean. Keep the way covers in good shape. May have changed by now. There is a time and a place. Bookmarks Bookmarks Digg del.